A "Newton" is the force required to change the motion of a one kilogram mass by one meter per second every second.
Newton (N) – the unit
The newton is the common unit used for measuring force. It was named in memory of Isaac Newton (1642-1727) who did much to clarify our understanding of forces and motion. Most students and adults have no understanding of the size of a force of one newton (1 N). It is similar to the force needed to support the weight of one apple.
(http://www.education.vic.gov.au/studentlearning/teachingresources/science/scicontinuum/sciglossarylz.htm)
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